Compared with heat-cured resins, chemically cured denture processing resin is typically softer and more porous due to higher monomer content. Which of the following best describes this property?

Compared with heat-cured resins, chemically cured denture processing resin is typically softer and more porous due to higher monomer content. Which of the following best describes this property?

• A. It is softer and more porous due to higher monomer content
• B. It is harder and less porous
• C. It has greater color stability
• D. It cures with less monomer

Answer: (A)

Higher residual monomer content in chemically cured resins leaves more unreacted monomer in the network, which acts as a plasticizer. This lowers the stiffness and hardness of the material and promotes the formation of microvoids, making the resin softer and more porous. Heat-cured resins achieve a higher degree of polymerization under elevated temperatures, reducing remaining monomer and minimizing porosity, so they are typically harder and less porous. Therefore, describing the property as softer and more porous due to higher monomer content best fits what is observed with chemically cured denture processing resin.

Higher residual monomer content in chemically cured resins leaves more unreacted monomer in the network, which acts as a plasticizer. This lowers the stiffness and hardness of the material and promotes the formation of microvoids, making the resin softer and more porous. Heat-cured resins achieve a higher degree of polymerization under elevated temperatures, reducing remaining monomer and minimizing porosity, so they are typically harder and less porous. Therefore, describing the property as softer and more porous due to higher monomer content best fits what is observed with chemically cured denture processing resin.